What are the main functions of nutrients in the body?

I - Provide essential and synthesis elements necessary for the preservation of lean mass and other tissues.
II - Provide elements necessary for cell repair.
III - Obtain energy.
IV - Optimize the transport and use of oxygen.
V - Maintain an optimal hydroelectrolytic balance.
VI - Regulate metabolic processes.
a) Only I, II and III are correct.
b) Only IV, V and VI are correct.
c) All statements are correct.
d) Only I, II, III and IV are correct.